whats formed ??

1. perhaps.. FeCl2 + H2SO4 / SO3

1)FeCl₃ acts as a oxidising agent and oxidises SO₂ to H₂SO₄.

2FeCl₃+SO₂+2H₂O→2FeCl₂+H₂ SO₄+2HCl

2)I think it will give FeO. but not sure.

3)When d reaction of CuSO₄ is done with KCN cupric cyanide is formed but it quickly decomposes to give cuprous cyanide and cyanogen. But in presence of excess KCN,Cuprous cyanide forms Potassium cuprocyanide.

2) Fecl 3 + H2O ???

agree with ashish regardin 1,SO₂ will reduce Fe³⁺ to Fe²⁺ and will get oxidised to H₂SO₄ in presence of water.

well lubu made it for 1st one...

ans1=FeCl2+H2SO4+HCl

2,3 still waiitng to be answered....

3. CuSO4.5H2O +KCN(excess)→ CuSO4.4H2O +KOH +HCN

2) Just giving it a shot.....

Cl₂ will disproportionate in NaOH,
Cl₂+NaOH ---> NaCl + NaOCl + H₂O

But, since Fe³⁺ can't be oxidised phurther, it wud have no other option than to hydrolyse.
So, the final products can be- NaCl, NaOCl, Fe(OH)₃.

3) Lubu ka answer sahi toh lagta hai.

@Lubu : In ur #5 did u mean to give the products for Fecl 3 + H2O ???

Actually i din't mean to ask the products

I was giving the answer for 2nd one as Fecl 3 + H20

WHICH i think is wrong as confirmed by eureka123-R.I.P-